GitHub: Disruption with some GitHub services
Timeline of updates
- resolved
On April 22, 2026 from 18:49 to 19:32 UTC , the Copilot Cloud Agent service began failing during session execution for users running the Agent HQ Codex agent. Codex agent sessions failed to start for all entry points (issue assignment, @copilot comment mentions). 0.5% of total Copilot Cloud Agent jobs were impacted (~2,000 failed jobs). Copilot and other agent sessions were unaffected. This was caused by a model resolution mismatch in Codex agent sessions, resulting in an incompatible model being used at runtime. A mitigation was deployed to select a stable default model for Codex agent sessions. We are working to harden the underlying model-resolution path so it correctly scopes to the requesting agent's supported models to prevent similar failure mode in the future.
From GitHub’s published incident history: for incidents before Rewindex began polling this status page, only the final update text is available.
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Cite this
Status incident (vendor impact label: minor) posted by GitHub, started 2026-04-27 16:48 UTC, resolved after 2.2 h, 1 update(s).
- Title
- Disruption with some GitHub services
- Vendor
- GitHub
- Date
- URL
- https://rewindex.com/company/github/incidents/vq183jvj6vrw
GitHub profileRecent GitHub incidentsAll outages on April 27, 2026GitHub in April 2026MarkdownJSON